Problem solving

This is my Problem solving for maths that I have been working on past one day, it was hard to get it at once but the more I did it the more I knew how to do it and I was working with Nickaela to solve the problem, we worked really well together. How did I worked out the problem was a bit hard first I divide 7 by 3 and that is 21 and 21 x 2 is 42 and 42 - 21 is 21 and that's how I worked out the problem.